C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Jan 16, 2012 | 09:26 AM
  #21  
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Originally Posted by garry owen
I dont want to cause any trouble
You're not causing any. The collective brain trust here will help get you back in the driver's seat eventually.

Originally Posted by garry owen
I need to know if the drive shafts from the diff to trailing arms are the same length.
I boxed mine up & sent off for a rebuild last week. They are originals and were the same length. (Also a '79 model)
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Old Jan 16, 2012 | 09:30 AM
  #22  
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Garry-

All of us are trying to help. There is no difference in width on '63-'64 vs. later trailing arms that I know of. Seeing a picture of your car and components would help us understand.

Try measuring the length of both half shafts, the later cars had slightly longer ones.
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Old Jan 16, 2012 | 09:35 AM
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Originally Posted by Stoge
You're not causing any. The collective brain trust here will help get you back in the driver's seat eventually.



I boxed mine up & sent off for a rebuild last week. They are originals and were the same length. (Also a '79 model)
and the arms are they the same width. I fear that I may have different model trailing arms on the car I imported to oz. as they are different thickness which is making it stick out past the body line of the car I think this is the case and if so then the drive might be wrong too so half the car could be the wrong model explaining why I have the wheel problem thanks stoge and scott
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Old Jan 16, 2012 | 09:45 AM
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Originally Posted by Mike Ward
Garry-

All of us are trying to help. There is no difference in width on '63-'64 vs. later trailing arms that I know of. Seeing a picture of your car and components would help us understand.

Try measuring the length of both half shafts, the later cars had slightly longer ones.
So that might be it, as I said earlier I cant get a picture for 3 days as my son will do it, as I dont know how to post it. Now back to my problem you have hit it on the head, the difference between the earlier and later arms is the thickness, and I have an early model arm on and the later shaft which is longer than the old one because it is thicker it is pushing out past the fender lip, thanks very much just need to confirm sizes and then import the bits to fix it, thank you all very much it is now 1.41 am tuesday and it is too late to check anything so thanks and enjoy your day will check all measurements now I have an idea it might be easy but as to which is the right one is to be found out thanks again cheers garry
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Old Jan 16, 2012 | 03:08 PM
  #25  
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Originally Posted by garry owen
and the arms are they the same width.
I didn't measure my T/A's but visually they were the same width.

You mentioned that you thought it might have a '62 - '63 trailing arm... somebody help me here, but didn't '62s have solid axles and '63's have drum brakes? If that were the case, you could rule out '62, and I'd be surprised if your disc brake assembly would work on a '63 arm. Either way, a '63 & '64 arm looks a little different than later arms and should be easy to pinpoint.

'63-'64:


'65-'82:
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Old Jan 16, 2012 | 03:51 PM
  #26  
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Originally Posted by garry owen
Now back to my problem you have hit it on the head, the difference between the earlier and later arms is the thickness, and I have an early model arm on and the later shaft which is longer than the old one because it is thicker it is pushing out past the fender lip,
Garry- I said pretty much the opposite. There is NO difference in thickness between earlier and later arms. Best hold off ordering parts for now.
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Old Jan 16, 2012 | 04:26 PM
  #27  
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Originally Posted by Stoge
I didn't measure my T/A's but visually they were the same width.

You mentioned that you thought it might have a '62 - '63 trailing arm... somebody help me here, but didn't '62s have solid axles and '63's have drum brakes? If that were the case, you could rule out '62, and I'd be surprised if your disc brake assembly would work on a '63 arm. Either way, a '63 & '64 arm looks a little different than later arms and should be easy to pinpoint.

'63-'64:


'65-'82:
Yeah, Chevy went to the IRS in '63, and then went to disk brakes in '65, the difference between the two arms is probably just a superficial difference having to do with drum brakes and disk brakes. I've never even seen a drum brake trailing arm, but from the photos that Stoge has provided, the only difference that I can detect is the bracket for the parking brake cable ('63-'64 on the inside, '65-'82 on the outside)and that little pad that is welded to the top of the later arm. Otherwise, they look pretty much the same.

This whole thing about different width trailing arms is sounding pretty nuts to me. I can't even wrap my head around it. C'mon, man, make with the photos, then we can actually see what you mean.


Scott

Last edited by scottyp99; Jan 16, 2012 at 04:30 PM.
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Old Jan 16, 2012 | 07:56 PM
  #28  
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Here's some measurements on a new set of arms (mind the parallax)





Right at the "kink" where it changes direction


Back at the Bump-Pad


Here's a straight edge against the inside of the arm up along the front (it's actually touching, just a fair radius on the edge so it looks like it's away)


And the distance it is into the edge of the arm (offset) at the rear of the opening for the 1/2 shaft


Not sure if any of this helps

Arms are 68-82 but have the same part number as 65-67
Not sure what the 63-64 arms are

I think one of your arms may have crushed, bent, broke the weld and opened, split, etc. based on your description

Hope it helps
Mooser
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Old Jan 17, 2012 | 10:29 PM
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All 63-82 trailing arms are the same. There is only one arm. Left and right arms are the same. Only thing different is the brackets. The brackets determine if the arm is left or right, 63-64, or 65-82. The thickness has nothing to do with where the wheel sits. The bearing support and spindle mount to the outer wall of the arm. The body of the arm could be 12 inches thick and it won't have any effect on the wheel.
As others have said the diff cannot be adjusted. The crossmember can be mounted either way and not change position of the diff. Measure your halfshafts. Both should be 13 7/8 " center to center of the u-joints.
Mike
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